This might be Henry Wesle's family. If so, then Henry and his brother Herman (twins), seems to be the only 2 children of Anton and his first wife. Maybe she died during childbirth? By the 1870 census, Anton remarried Catherine, who seems to have had some of these children from a previous marriage.
I lost track of Henry in the 1880 census, and then Anton and his family in the 1900 census.
Henry and Herman's ages are off by 2 years in these census' from the 1900 census.
1860 Bear Creek, Sauk County, Wisconsin
Anton Wessle, age 42, born abt 1818 Württemberg
Hermann Wessle, age 2, born abt 1858 Wisconsin
Henry Wessle, age 2, born abt 1858 Wisconsin
1870 Bear Creek, Sauk County, Wisconsin
Anthony Westley, age 53, born abt 1817 Württemberg / Wurttemberg
Catherine Westley, age 33, born abt 1837 Holstein
Elizabeth Westley, age 13, born abt 1857 Pennsylvania
Joseph Westley, age 11, born abt 1859 Wisconsin
Mary Westley, age 9, born abt 1861 Wisconsin
Frank Westley, age 8, born abt 1862 Wisconsin
Arnold Westley, age 6, born abt 1864 Wisconsin
Herman Westley, age 12, born abt 1858 Wisconsin
Henry Westley, age 12, born abt 1858 Wisconsin
1880 Bear Creek, Sauk County, Wisconsin
Anton Wesle, self, age 64, born abt 1816 Wirtemburg, parents born Wirtemburg
Catherine Wesle, wife, age 44, born abt 1836 Oldenburg, parents born Oldenburg
Herman Wesle, son, age 22, born abt 1858 Wisconsin
Mary Gelhouse, stepdaughter, age 18, born abt 1862 Wisconsin
Joseph Wesle, son, age 21, born abt 1859 Wisconsin
Arnold Wesle, son, age 16, born abt 1864 Wisconsin